Replace ThreadDumpAddresses with a timer.

[jgarzik]

Wanted to eliminate a silly thread that does nothing but waste system resources as a poor man's cron.

boost.asio also has deadline_timer, which is worth investigating.

[jgarzik]

Note not intended for 0.7.

[laanwj]

Investigating boost.asio sounds like a good idea, before we build it entirely from scratch.

[BitcoinPullTester]

Automatic sanity-testing: PASSED, see http://jenkins.bluematt.me/pull-tester/5cb618146cedc7630513afb016ef386e6bd4f172 for binaries and test log.

[sipa]

Looks like a lot of code for a feature that should be standard. I assume it will be easier using boost::asio?

[jgarzik]

Most likely we can use boost.asio deadline_timer... but that requires moving the "io_service" from RPC into the core code, so that non-RPC code may take advantage of the async I/O engine (and the timers that lie within).

[luke-jr]

Needs rebase.

[jgarzik]

closing, self-meh.

should consider boost deadline timer, rather than creating threads for same.